package com.yupi.yupicturebackend.service.impl;


import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.Exception.BusinessException;
import com.yupi.yupicturebackend.Exception.ErrorCode;
import com.yupi.yupicturebackend.manager.auth.StpKit;
import com.yupi.yupicturebackend.mapper.UserMapper;
import com.yupi.yupicturebackend.model.dto.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.yupi.yupicturebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
 * @author chenhx
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-05-12 16:32:26
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }


    @Override
    public boolean userLogout(HttpServletRequest request) {
        Object isLogin = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (isLogin == null){
            return false;
        }
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1.校验
        //1.1判断是否为空
        if (StrUtil.isBlank(userAccount) || StrUtil.isBlank(userPassword) || StrUtil.isBlank(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        //1.2账号长度不能小于4
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        // 1.3 账号密码长度不能小于8
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        // 1.4 账号密码是否一致
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }

        // 2.查数据库看是否存在该用户，不可以重复注册
        boolean isExist = lambdaQuery().eq(User::getUserAccount, userAccount).exists();
        if (isExist) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号已存在");
        }

        // 3.加密
        String encryptPassword = getEncryptPassword(userPassword);

        // 4.存入数据库
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("默认昵称：");
        user.setUserRole(UserRoleEnum.USER.getValue());

        boolean isSuccess = save(user);
        if (!isSuccess) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，系统内部异常");
        }

        return user.getId();
    }

    @Override
    public String getEncryptPassword(String userPassword) {
        // 盐值，混淆密码
        final String SALT = "yupi";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {

        // 1.校验
        //1.1判断是否为空
        if (StrUtil.isBlank(userAccount) || StrUtil.isBlank(userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号密码为空！");
        }
        //1.2账号长度不能小于4
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号不存在！");
        }
        // 1.3 账号密码长度不能小于8
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误！");
        }

        String encryptPassword = getEncryptPassword(userPassword);

        // 2.查询是否存在该用户
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = baseMapper.selectOne(queryWrapper);
        if (user == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误！");
        }

        // 3.将用户保存在session中
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        // 4. 记录用户登录态到 Sa-token，便于空间鉴权时使用，注意保证该用户信息与 SpringSession 中的信息过期时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 从session中获取当前用户
        Object currentUser = request.getSession().getAttribute(USER_LOGIN_STATE);
        User user = (User) currentUser;
        if (user == null || user.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "用户未登陆！");
        }

        return user;

    }

    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }


}




